Attacker Drains $182M From Beanstalk Stablecoin Protocol

Attacker Drains $182M From Beanstalk Stablecoin Protocol

Attacker Drains $182M From Beanstalk Stablecoin Protocol

By Sam Kessler

Beanstalk Farms, an Ethereum-based stablecoin protocol, was exploited for $182 million Sunday.

The attack was flagged on Twitter by blockchain security firm PeckShield, which said the attacker made away with at least $80 million in crypto, although the losses suffered by the protocol were much larger.

The market for Beanstalk’s BEAN stablecoin collapsed as a result of the attack. At press time, the token was down 86% from its $1 peg according to CoinGecko.

When reached for comment, Beanstalk pointed CoinDesk to a post in its Discord server summarizing how the attack occurred.

According to the summary, the attacker took out a flash loan on lending platform Aave which enabled them to amass a large amount of Beanstalk’s native governance token, Stalk. With the voting power granted by these Stalk tokens, the attacker was able to quickly pass a malicious governance proposal that drained all protocol funds into a private Ethereum wallet.

Project leads wrote in the attack summary:

“Beanstalk did not use a flash loan resistant measure to determine the % of Stalk that had voted in favor of the BIP. This was the fault that allowed the hacker to exploit Beanstalk.”

Beanstalk’s smart contracts were audited by the blockchain security firm Omnicia. However, the audit was completed before the introduction of the flash loan vulnerability, the firm said in a Sunday post-mortem.

Beanstalk declined to provide details to CoinDesk regarding whether funds would be reimbursed to users, saying more news will be coming in a town hall event scheduled for Sunday.

According to PeckShield, the attacker appeared to donate $250,000 of the stolen funds to a Ukrainian relief wallet.

This is the latest in a string of major decentralized finance (DeFi) exploits to occur in the past few weeks. In March, Axie Infinity’s Ronin Blockchain was exploited for $625 million in an attack that U.S. officials have linked to North Korea.

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